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https://www.readbyqxmd.com/read/28097285/localization-in-an-idealized-heterogeneous-elastic-sheet
#1
Bekele J Gurmessa, Andrew B Croll
Localized deformation is ubiquitous in many natural and engineering materials as they approach failure, and a significant effort has been made to understand localization processes with simple continuum models. Real materials are much more commonly heterogeneous but it is unclear exactly how heterogeneity affects outcomes. In this work we study the response of an idealized heterogenous elastic sheet on a soft foundation as it is uniaxially compressed. The patterned surface layers are created by selective ultraviolet/ozone treatment of the top surface of a polydimethylsiloxane (PDMS) sample using a TEM grid as a mask...
January 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28097215/an-ambiguity-principle-for-assigning-protein-structural-domains
#2
Guillaume Postic, Yassine Ghouzam, Romain Chebrek, Jean-Christophe Gelly
Ambiguity is the quality of being open to several interpretations. For an image, it arises when the contained elements can be delimited in two or more distinct ways, which may cause confusion. We postulate that it also applies to the analysis of protein three-dimensional structure, which consists in dividing the molecule into subunits called domains. Because different definitions of what constitutes a domain can be used to partition a given structure, the same protein may have different but equally valid domain annotations...
January 2017: Science Advances
https://www.readbyqxmd.com/read/28097076/a-critical-issue-in-model-based-inference-for-studying-trait-based-community-assembly-and-a-solution
#3
Cajo J F Ter Braak, Pedro Peres-Neto, Stéphane Dray
Statistical testing of trait-environment association from data is a challenge as there is no common unit of observation: the trait is observed on species, the environment on sites and the mediating abundance on species-site combinations. A number of correlation-based methods, such as the community weighted trait means method (CWM), the fourth-corner correlation method and the multivariate method RLQ, have been proposed to estimate such trait-environment associations. In these methods, valid statistical testing proceeds by performing two separate resampling tests, one site-based and the other species-based and by assessing significance by the largest of the two p-values (the pmax test)...
2017: PeerJ
https://www.readbyqxmd.com/read/28095927/small-alteration-big-impacts-effects-of-small-scale-riparian-forest-management-on-host-parasite-dynamics-in-streams
#4
C Lagrue, A A Besson, A Lecerf
Environmental changes and ecological disturbances can have large and unpredictable effects on parasite dynamics. Increasing human impacts on freshwater ecosystems through land use may thus modify the distribution and abundance of parasites and have cascading effects on host populations. Here we tested the effects of small-scale riparian forest management on the nematode Cystidicoloides ephemeridarum and its insect intermediate host Ephemera danica in forested streams. We assessed the impacts of harvesting riparian trees on parasite prevalence and abundance concomitantly with host densities...
January 18, 2017: Journal of Helminthology
https://www.readbyqxmd.com/read/28095862/different-survival-analysis-methods-for-measuring-long-term-outcomes-of-indigenous-and-non-indigenous-australian-cancer-patients-in-the-presence-and-absence-of-competing-risks
#5
Vincent Y F He, John R Condon, Peter D Baade, Xiaohua Zhang, Yuejen Zhao
BACKGROUND: Net survival is the most common measure of cancer prognosis and has been used to study differentials in cancer survival between ethnic or racial population subgroups. However, net survival ignores competing risks of deaths and so provides incomplete prognostic information for cancer patients, and when comparing survival between populations with different all-cause mortality. Another prognosis measure, "crude probability of death", which takes competing risk of death into account, overcomes this limitation...
January 17, 2017: Population Health Metrics
https://www.readbyqxmd.com/read/28095476/a-systematic-review-of-ebola-treatment-trials-to-assess-the-extent-to-which-they-adhere-to-ethical-guidelines
#6
Thomas Richardson, Andrew McDonald Johnston, Heather Draper
BACKGROUND: Objective: To determine to what extent each trial met criteria specified in three research frameworks for ethical trial conduct. Design: Systematic review and narrative analysis. METHODS AND FINDINGS: Data sources: MEDBASE and EMBASE databases were searched using a specific search strategy. The Cochrane database for systematic reviews, the PROSPERO database and trial registries were examined. A grey literature search and citation search were also carried out...
2017: PloS One
https://www.readbyqxmd.com/read/28095033/detection-of-the-toughest-pedestrian-injury-risk-as-a-smooth-function-of-age
#7
Tobias Niebuhr, Mirko Junge
OBJECTIVE: While it is common to regard age-specific groups (e.g. children, adults, elderly), smooth trends conditional on the age are mainly ignored in the literature. The present study examines the pedestrian injury risk in full-frontal pedestrian to passenger car accidents and incorporates the age -besides the collision speed and the injury severity- as a plug-in parameter. METHODS: Recent work introduced a model for pedestrian injury risk functions using explicit formulae with easily interpretable model parameters...
January 17, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28094295/loss-of-pafr-prevents-neuroinflammation-and-brain-dysfunction-after-traumatic-brain-injury
#8
Xiang-Jie Yin, Zhen-Yan Chen, Xiao-Na Zhu, Jin-Jia Hu
Traumatic brain injury (TBI) is a principal cause of death and disability worldwide, which is a major public health problem. Death caused by TBI accounts for a third of all damage related illnesses, which 75% TBI occurred in low and middle income countries. With the increasing use of motor vehicles, the incidence of TBI has been at a high level. The abnormal brain functions of TBI patients often show the acute and long-term neurological dysfunction, which mainly associated with the pathological process of malignant brain edema and neuroinflammation in the brain...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093078/treatment-outcomes-for-multidrug-resistant-tuberculosis-under-dots-plus-a-systematic-review-and-meta-analysis-of-published-studies
#9
Kelemu Tilahun Kibret, Yonatan Moges, Peter Memiah, Sibhatu Biadgilign
BACKGROUND: Anti-tuberculosis drug resistance is a major public health problem that threatens the progress made in tuberculosis care and control worldwide. Treatment success rates of multidrug-resistant tuberculosis (MDR-TB) is a key issue that cannot be ignored. There is a paucity of evidence that assessed studies on the treatment of MDR-TB, which focus on the effectiveness of the directly observed treatment, short-course (DOTS)-Plus program. Therefore, it is crucial to assess and summarize the overall treatment outcomes for MDR-TB patients enrolled in the DOTS-Plus program in recent years...
January 17, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28092503/propagation-modeling-and-analysis-of-molecular-motors-in-molecular-communication
#10
Youssef Chahibi, Ian F Akyildiz, Ilangko Balasingham
Molecular motor networks (MMNs) are networks constructed from molecular motors to enable nanomachines to perform coordinated tasks of sensing, computing, and actuation at the nano- and micro- scales. Living cells are naturally enabled with this same mechanism to establish point-to-point communication between different locations inside the cell. Similar to a railway system, the cytoplasm contains an intricate infrastructure of tracks, named microtubules, interconnecting different internal components of the cell...
December 2016: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28092407/study-of-potential-health-effects-of-electromagnetic-fields-of-telephony-and-wi-fi-using-chicken-embryo-development-as-animal-model
#11
Henri Woelders, Agnes de Wit, Alexander Lourens, Norbert Stockhofe, Bas Engel, Ina Hulsegge, Dirkjan Schokker, Paula van Heijningen, Stefan Vossen, Dave Bekers, Peter Zwamborn
The objective of this study is to investigate possible biological effects of radiofrequency electromagnetic fields (RF-EMF) as used in modern wireless telecommunication in a well-controlled experimental environment using chicken embryo development as animal model. Chicken eggs were incubated under continuous experimental exposure to GSM (1.8 GHz), DECT (1.88 GHz), UMTS (2.1 GHz), and WLAN (5.6 GHz) radiation, with the appropriate modulation protocol, using a homogeneous field distribution at a field strength of approximately 3 V/m, representing the maximum field level in a normal living environment...
January 16, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28092210/the-insights-of-health-and-welfare-professionals-on-hurdles-that-impede-economic-evaluations-of-welfare-interventions
#12
J Schepers, J Plaete, I De Bourdeaudhuij, L Annemans, S Simoens
OBJECTIVES: Four hurdles associated with economic evaluations in welfare interventions were identified and discussed in a previous published literature review. These hurdles include (i) 'Ignoring the impact of condition-specific outcomes', (ii) 'Ignoring the impact of QoL externalities', (iii) 'Calculation of costs from a too narrow perspective' and (iv) 'The lack of well-described & standardized interventions'. This study aims to determine how healthcare providers and social workers experience and deal with these hurdles in practice and what solutions or new insights they would suggest...
January 16, 2017: Expert Review of Pharmacoeconomics & Outcomes Research
https://www.readbyqxmd.com/read/28090181/how-much-we-think-of-ourselves-and-how-little-we-think-of-others-an-investigation-of-the-neuronal-signature-of-self-consciousness-between-different-personality-traits-through-an-event-related-potential-study
#13
Auwal Bello Hassan, Tahamina Begum, Mohammed Faruque Reza, Nasir Yusoff
BACKGROUND: Previous studies have revealed that self-related tasks (items) receive more attention than non-self-related, and that they elicit event-related potential (ERP) components with larger amplitudes. Since personality has been reported as one of the biological correlates influencing these components, as well as our behavioural differences, it is important to examine how it affects our self-consciousness in relation to tasks of varied relevance and the neurological basis. METHODS: A total of 33 male and female undergraduate Malaysian medical students of Universiti Sains Malaysia (USM) participated in the study...
November 2016: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28090170/gender-s-role-in-misperceptions-of-peers-sexual-motives
#14
Rose Wesche, Graciela Espinosa-Hernández, Eva S Lefkowitz
The sexual double standard influences men's and women's sexual attitudes and behavior, leading men and women to consider distinct sexual motives, or reasons whether or not to engage in sexual intercourse (Crawford & Popp 2003; Reiss 1964). The goal of the present paper was to document how the sexual double standard shapes perceptions of peers' sexual motives. We build on past research by using open-ended questions and measuring perceptions of both same-gender and other-gender peers. The sample included 154 heterosexual college students (50% female, 49% European American, 25% Latino American, 26% African American) recruited via probability sampling...
December 2016: Sexuality & Culture
https://www.readbyqxmd.com/read/28089787/antituberculosis-drugs-reducing-efflux-increasing-activity
#15
REVIEW
Liliana Rodrigues, Tanya Parish, Meenakshi Balganesh, José A Ainsa
In mycobacteria, it was assumed that efflux pumps only had a marginal role in drug resistance. In recent years, owing to the need to find novel drugs against multidrug-resistant tuberculosis, it has become clear that efflux should not be ignored. Although efflux inhibitors have been very useful for characterizing in vitro the properties of efflux pumps, their usefulness in vivo is limited because of their toxicity. Alternatively, programs aimed at discovering novel drugs for treating tuberculosis should implement strategies to characterize efflux liability of candidate drugs...
January 12, 2017: Drug Discovery Today
https://www.readbyqxmd.com/read/28089603/melatonin-inhibits-snake-venom-and-antivenom-induced-oxidative-stress-and-augments-treatment-efficacy
#16
Rachana D Sharma, Gajanan D Katkar, Mahalingam S Sundaram, Basavarajaiah Swethakumar, Kesturu S Girish, Kempaiah Kemparaju
Snakebite is a neglected health hazard, its patho-physiology had been focused on systemic and local toxicities; but, venom and antivenom induced oxidative stress has been ignored for a long time. Antivenom therapy although neutralizes venom lethality and saves many lives it remains ineffective against oxidative stress. This prompted us to complement antivenom with an antioxidant molecule melatonin that would protect against oxidative stress and increase the efficacy of the existing snakebite therapy. Here we show that D...
January 12, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28089351/longitudinal-association-between-hippocampus-atrophy-and-episodic-memory-decline
#17
Tetiana Gorbach, Sara Pudas, Anders Lundquist, Greger Orädd, Maria Josefsson, Alireza Salami, Xavier de Luna, Lars Nyberg
There is marked variability in both onset and rate of episodic-memory decline in aging. Structural magnetic resonance imaging studies have revealed that the extent of age-related brain changes varies markedly across individuals. Past studies of whether regional atrophy accounts for episodic-memory decline in aging have yielded inconclusive findings. Here we related 15-year changes in episodic memory to 4-year changes in cortical and subcortical gray matter volume and in white-matter connectivity and lesions...
December 11, 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/28089139/cannabidiol-claims-and-misconceptions
#18
Ethan B Russo
Once a widely ignored phytocannabinoid, cannabidiol now attracts great therapeutic interest, especially in epilepsy and cancer. As with many rising trends, various myths and misconceptions have accompanied this heightened public interest and intrigue. This forum article examines and attempts to clarify some areas of contention.
January 11, 2017: Trends in Pharmacological Sciences
https://www.readbyqxmd.com/read/28088678/three-dimensional-lumbar-segment-movement-characteristics-during-paediatric-cerebral-palsy-gait
#19
D Kiernan, A Malone, T O'Brien, C K Simms
Kinematic analysis of the trunk during cerebral palsy (CP) gait has been well described. In contrast, movement of the lumbar spine is generally ignored. This is most likely due to the complex nature of the spine. As an alternative to using complex sensor protocols, this study modelled the lumbar region as a single segment and investigated characteristic patterns of movement during CP gait. In addition, the impact of functional level of impairment and the relationship with lower lumbar spinal loading were examined...
January 3, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28088630/support-dependent-active-species-formation-for-cuo-catalysts-leading-to-efficient-pollutant-degradation-in-alkaline-conditions
#20
Yibing Li, Lianshuang Guo, Dekang Huang, Ali Jawad, Zhuqi Chen, Jiakuan Yang, Weidong Liu, Yan Shen, Mingkui Wang, Guochuan Yin
Redox metal ions play the crucial role in versatile advanced oxidation technologies, in which controlling the active species formation through catalyst design is one of the key challenges in oxidant utilization. This work describes an example of different active species formations in CuO-mediated degradation just because of supporting material differences. Although three CuO catalysts were prepared by similar procedures, it was found that CuO-MgO catalyst demonstrated high efficiency in phenol degradation with bicarbonate activated H2O2, in which the superoxide radical is crucial, while hydroxyl radical and singlet oxygen are ignorable...
December 31, 2016: Journal of Hazardous Materials
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